Crane



Patented Sept. 6, 1927.

UNITED STATES PATENT t OFFICE.

LEONARD D. Nirsoiv, or 'WAYZATAMINNESOTA AssiGNon To MARQUETTEMANU- iAc'rUniivG COMPANY, or snrAUL, MrNNnso'rA, n coRPoRATToN or MINNESOTA.

Original application filed vNovember 2, 1925, Serial No. 66,308." Divided and serial No. 120,779.'

This inventionrelates to new and useful improvements in cranes, and particularly to cranes of the portable type adapted to be to a hoisting drum and `to, the load,thus

allowing a change. from indirect to direct draft. by the drum. v

The feature of the invention resides also in the detail construction of the swivel, inf y cluding a split cylindrical socket member as a part of the boom frame, substantially axially tangent to the forward side of the chain-receiving portion of the ldrum, and

1 including forwardly projecting arms forming with the split portion, a slot, disposed in substantially parallel relation to the socket axis, and further. including a split sleeve telescopically engaged and rotatable in the socket, withthe split as a slot also.

parallel with the socket axisand normally facing rearwardly in substantiallydiametrical relation to the socket slot, whereby the sleeve may be rotated and the slotsmade to register on the forward side of the frame, to permit removal of the intermediate portion of a chain when the same is attached at opposite ends. This arrangement permits the crane to be used as a winch for effecting a direct pull on the load, as when towing. Y.

Advantages will be rfurther-set forth in the description of the drawings forminga part of this application, and in said drawings:

Figure having my improved swivel structure applied thereto, in certainl relationto a winding drum Figure 2 is an enlarged detail sectional view showing the general -construction ofk the swivel head at the upper end of the.

boom; l

Figure 8 is a detail section corresponding 1 is a perspective viewy of aV cranek this application led July toFigure 2, yshowing Ahowvthe lifting chain or cable is disconnected fromtheguide sheave at the upper end of the boom, vat the forward side of the boom andof thechainreceiving portion of the drum; and Figure 4 is a plan section on line-l--Ll of Figure 2.

For purposes of illustration, a crane has I vbeen shown comprising lower parallel supporting members 1, boom members 2 pivoted at the lower ends to the support members, and held at their upper ends by a casting 5, as one portion of my improved :swivel construction. This yelement 5 provides a split cylindrical socket member 6,.

substantially axially tangent to the forward sideA of the chain-receiving portion 15 of a winding drum l14, suitably held in bearings adjacent the lower end vof the boom, and

adapted for operation in any well-known manner. Extending rearwardly of the cylindrical portion 6 ofthe element 5 are ears 7, between which are connected the upper. l

ends of adjustably extensible brace members 8. The cylindrical portion has forwardly extending spaced parallel arms 9, forming with the split portion a .slot disposed in y substantially parallel. relation with the sbeket axis.

the upper end of a clevis 13. The element 6 is properly secured by bolts 2O passing through lateral extensions 21 of the element 6. Telescopically engaging within the socket element 6 is a split sleeve adapted for rotavtion in a socket., and having upwardly ex- The outer .ends of these armsl are apertured as at 10 and a boltv 11 tra- Y verses these openings, and the openings at "A13 a slot 32, is parallel with thev socket axis, l

and, as shown in. `Figure 2, normally faces rearwardly in substantially diametric relation to the socket slot 33, whereby by rotation of the sleeve, the slots can be made' to around a pulley 3"? and-has a hook 38 at its forward end engaged with a clevisl, this being the normal connection when used for lifting purposes.

By means ofthe elongated openings, or slots, 32 and 33, the chain may be readily disconnected from the upper end of the register and, therefore, there is no possi? bility ofaccidentallrelease of the chain during a loadflifting operation.

rllhus it will be seen that-a crane equipped with aA device contemplated by this inven tion may be quickly converted into a device for use as a winch or for lifting.

Having described my invention, what l claim is:

l. A winding apparatus comprising a chain and a drum whereon itis wound, a sheave for said chain, a supporting member for saidsheave having a cylindrical portion throughv which said chain passes, a head adaptedto rotatably receive said cylindrical portion, said head and-said cylindrical portion having elongated openings normally oppositely arranged but` adapted to be aligned to permitl the chain to be passed therethrough to separate it from saidlsheave and supporting member.

2. A frame and a winding drum thereon said frame having a split'cylindrical socket member, substantially axially tangenty to the forward side ofthe chain-receiving portion ofV the drum, and havingv forwardly projecting arms, forming withthe split portion a slot disposed in substantially parallel relation with the socket axis, and a `split sleeve telescopically engaged andA rotatable in the socket, and having a sheave journaled in its `upper portion, with the split as a slot parallel with the socket axis and normally facing rearwardly in substantial diametri# calirelation tothe socket slot, whereby, by rotation of the sleeve, said slots can be made to register on the forward side ofthe frame, to permit removal of'an intermediate portion'y of a chain without Vremoval of the sheave, and while the opposite ends of the chain remain attached to the drum and, work, thusallowing a change from indirect to direct draft byl the drum, the arms of said socket having a cross-clamping bolt supporting a clevis for engagement by a chain hook.

3. A frame and awinding drum thereon, saidframe having a split cylindrical socket member, substantially axially tangentl to the forward sideof the chain-receivingportion of the drum, and having forwardly projecting arms formingwith the split por, tion a slot' disposed in substantially parallel relation with the socket axis, and facing forwardly, and a split sleeve rotatable in the socket, and having a sheave j ournaled in its upper portion, with. the split.y as a,` slot parallel with the socket axis, and normally facing rearwardly in substantial diametrical relation to the socket slot, whereby, by rotation ofthe sleeve, saidslots canbe made.. to register on theforward side ofthe frame, to permit removal of anintermediate por, tion of a chain without removal of the. sheave, while the oppositeends kof thechain remain attachedto the drum and.work,pthus allowing al change from indirect to direct draft by thedrum, or viceversa.

4. A support having a socket open at. one. side, and afsheave havinpav tubularexten-l sionl rotatable in said socket, and` open, at that side opposite the sheave, the openings being normally out of register but adapted to be registeredlby rotation, the said sheave., when registration takes place, beingI opposite the point of.. registration.

5. A support having a socket open at; one

side,vand a sheave having. a tubular extension rotatably supported by gravityin said; socket, andI open at that sideioppositethe sheave, the openings being normally out of.

lll)

register lbut adapted to be registered by ro-,

tat-ion, the said sheave, when registration takes place, being substantially opposite the, point of` registration.

6. In a device o fV theiclass described a. drum, a support, asheave having `a tubular extension rotatable inthe support, a flexibley draft element` connectedV to. the drum and: passing through the tubular extensionand; engaged with the sheave, saidy support andz tubularA extension each having an opening, said openings normally positively held out.` off registerfas the result of draft` on the -sheave but adapted to be registered when draft is discontinued, to permit the draft;

element to bepassed therethroughyindirec.

tion of draft.

7 A winding apparatus comprising a. drum, a support, a sheave having a tubular-A` extension rotatable in the support, the sheave normally lying forwardly ofgthe support in direction of draft, a flexible element connecting the drum,4 and passing through the tubular member` and forwardly overthe sheave, said -support andv tubular memberY having openings out of register during= draft, but adapted to be registeredito per,-VV mit the draftelement to be passedJ therethrough for separation from the sheave andv supporting member, registration taking. place when the sheave lies at a point substantially diametric to its draft position.

8. A. device of the class described oomprisng a drum, a support, a sheave having a tubular element rotatable in the support, said support and tubular element having 5 openings registerable, and a cable connected with the drum passing through the tubular element and about the sheave and adapted to be removed through the registered openings, the registration being effected when, the sheave is moved laterally of the clirec- 10 tion of draft.

In Witness whereof, I have hereunto set my hand this 1st day of July, 1926.

LEONARD D. NILSN. 

